Customs Act

149.1 An affidavit of an officer, sworn before a commissioner or other person authorized to take affidavits, setting out that the officer has charge of the appropriate records and has knowledge of the practice of the Agency or the Canada Revenue Agency, as the case may be, and that an examination of the records shows that a notice of assessment under Part V.1 was mailed or otherwise sent to a person under this Act and that, after careful examination and search of the records, the officer has been unable to find that a notice of objection or of appeal from the assessment was received within the time allowed for the notice, is evidence of the statements contained in the affidavit.